linux-kernel - Re: Dead Config in mm/percpu.c

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Date:	Tue, 10 Aug 2010 02:26:45 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Christian Dietrich <stettberger@...ucode.de>,
	David Howells <dhowells@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: Dead Config in mm/percpu.c

On Wed, Jul 21, 2010 at 11:12, Tejun Heo wrote:
> On 07/21/2010 11:22 AM, Christian Dietrich wrote:
>> We found, that CONFIG_NEED_PER_CPU_KM is a dead symbol, so it isn't defined
>> anywhere. Cause of that the percpu_km.c is never included anywhere. Is
>> this a intended dead symbol, for use in out of tree development, or is
>> this just an error?
>
> Oh, it's new code waiting to be used.  It's for cases where SMP is
> used w/o MMU.  IIRC, it was blackfin.

yep.  unfortunately, we're in the middle of making a release on top of
2.6.34.x.  hopefully we should be able to get a patch out for the
2.6.37 merge window at the latest.
-mike
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